Some imbalance and balance postures of a passive quadruped robot with a simplified mathematical model are studied. Through analyzing the influence of the touchdown angle of the rear leg on the posture of the trunk during the flight phase. the stability criterion is concluded: the closer are the two moments which are the zero time of the pitching angle and the peak time of the center o... https://parisnaturalfoodes.shop/product-category/microdermabrasion-scrub/